Will Ferrell joins Michelle Obama in a new "Let's Move!" video to encourage children to make healthy lifestyle choices.

Will Ferrell is dead serious about eating healthy and getting enough exercise.

The funny man pairs up with First Lady Michelle Obama in a new public service announcement for “Let’s Move,” a campaign to fight childhood obesity by teaching youngsters about healthier lifestyle choices.

In the humorous video clip, Obama and Ferrell play it straight as they host a “focus group” with young children to talk about their favorite fruits and vegetables.

One kid names strawberries while another mentions cucumbers. A third girl says, "bananas," while slumping in her chair, prompting Ferrell to do the same.

“I like to get relaxed, too," he tells her after slinking down in his seat. He then asks the room: “Also, is diet cola — is that a vegetable?”

At one point, Ferrell asks what's needed to have a “great beach bod” for the summer. Obama informs him it's not about "tricks," but having dedication, consistency and simply eating right.

“So no entire Honeybaked Hams?” Ferrell asks.

Also off the list: Krill oil supplement sandwiches for school lunches. “Does that sound good?” Ferrell asks the kids, who respond with moans and by shaking their heads.

“Okay, we’ll take that off the list,” he deadpans as he and the first lady agree to scrub that from the record.

Finally, Obama asks the kids about celebrities they like, particularly their favorite comedian. As Ferrell begins to crack a grin, one kid shouts, “Jimmy Fallon,” causing Obama to start laughing.

“That’s mine, too,” says another child.

A clearly annoyed Ferrell scans the room. "Anybody else?” he asks. He then whispers to Obama: “You’re lucky I didn’t ask them who their favorite first lady is.”

This isn't the first funny video Ferrell and Obama have collaborated on: Last week, they appeared with Fallon in a skit during the new “Tonight Show” host's first week of the program.